Arsenic

Paper presented to the International Conference on Water hook in Disasters held in Kolkata on 5-6 December 2002 ARSENIC pollution OF GROUNDWATER IN WEST BENGAL (INDIA): BUILD-UP IN SOIL-CROP SYSTEMS S. K. Sanyal1 and S. K. T. Nasar2 1 De firearmment of country chemistry and Soil Science, Faculty of Agriculture Main Campus, Mohanpur, 2 board of directors of Research, Bidhan Chandra Krishi Viswavidyalaya, Kalyani-741235, Nadia, West Bengal, India Abstract A large plowshare of the Bengal delta basin restrain by the rivers Bhagirathi and Padma is stirred by ratsbane contamination of groundwater of geogenic theme the exact sequence of geochemical reactions releasing atomic number 33 from the aquifer sediments is still debated. lone(prenominal) less than 10% of the total groundwater accounts for drinking intention bit more than 90% is used for clothe-irrigational requirements. The present communion deals with the semen of arsenic trioxide contamination in groundwater, accumulation of the toxin in soils and dos in the affected belt of West Bengal irrigated with contaminated groundwater, and in carnal tissues and products, and demonstrates the pathways, other than drinking water, through which arsenic may demand access to human, animal and crop systems.

The retention of arsenic by the soil organic fraction in the affected sites has been demonstrated, so also the release potential of As from the resulting organo-As complexes by the competing oxyanions such(prenominal) as phosphate and nitrate. The application of FYM and phosphate was found to anticipate opposing effect on release of native and lend oneself arsenic in the contaminated soils, with FYM reducing such release, ther! eby tending to moderate the toxic effect of arsenic in soil-plant system. This agreed well with the findings of a rice pot-culture experiment. Different crop plants raised in a crop cafeteria experiment exhibited intensify tendencies to accumulate arsenic in different plant part in the following sequence: root>stem>leaf>economic produce. The...If you want to get a full essay, order it on our website: OrderEssay.net

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